Big Mack,
As the owner of an '85rt, here's my take:
- Get clear on your vision: what will you be looking at and riding when you've attained that image you have in your mind?
You'll need this to get you through the times where your project can seem like a Bataan Death March slog with no honorable way out.
- Get a Haynes and/or Chilton's manual. Read, read, read.
- Make your list. Organize it (i.e. 'Buy', 'Do', etc.), prioritize it.
- Box, bag and label everything you strip off the bike. Take pictures while you're taking it down. Lots of pictures. You never know when life will keep you away from your project for, say, a week or two or a month and you do not want to rely on your memory and fall victim to the "what went where..?" syndrome.
- Dive in. Have fun.
It's damned rewarding and satisfying to bring to fruition the resurrection of a great bike.